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A break from family duties: The Duke of Cambridge to start ultra marathon Credit: Michael Middleton/PA

The Duke of Cambridge will start the Ring O'Fire Anglesey Coastal Ultra Marathon on Anglesey later. The Ultra Marathon is an annual 135 mile coastal marathon circumnavigating the Isle of Anglesey. The foot race is staged over three days and follows the Anglesey Coastal Path around the island.

Prince William will meet a number of runners and their families and a selection of volunteers involved in the administration of the race before officially starting the Ultra Marathon.

The 135 mile distance and 13,695 feet of vertical ascent makes the Ring O' Fire one of the most extreme ultra marathons in the United Kingdom.

Prince William is to leave his home and his job as an RAF Pilot on Anglesey at the end of next month. He was speaking at the Anglesey show on his first official engagement in Wales since returning here from paternity leave. He show goers by demonstrating his Welsh.

The television series that documents Prince William's time with the Search and Rescue operations coincides with the news that the service is to be taken away from the RAF and privatised - a move that the prince is believed to have opposed.

"As captain you're trying to play out the entire rescue, the transit to the rescue and back again in your mind, and pick up any circumstances or problems you can foresee, and try and fix them on the ground before you get airborne," he says in the programme.

The Sea King winches one of the Search and Rescue crew Credit: BBC Wales